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                  <h1 class="post-title">swift3-11 函数</h1>

                  <p class="post-byline">
                    by  · 2017年02月27日 · 1097 Words ·
                    ~3min reading time |
                    <a href="https://github.com/brasbug/brasbug-hugo-blog/tree/master/content/post/2017/2017-02-27-swift11.md"
                       target="_blank">Improve on <i class="fa fa-github"></i></a>
                  </p>

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                  <div class="entry">
                    <div class="entry-inner">
                      
                      <p><strong>函数定义</strong></p>

<blockquote>
<p>Swift 定义函数使用关键字 func。
  定义函数的时候，可以指定一个或多个输入参数和一个返回值类型。
  每个函数都有一个函数名来描述它的功能。通过函数名以及对应类型的参数值来调用这个函数。函数的参数传递的顺序必须与参数列表相同。
  函数的实参传递的顺序必须与形参列表相同，-&gt; 后定义函数的返回值类型。</p>
</blockquote>

<p>示例:</p>

<pre><code>func hello(name:String)-&gt; String{
    return &quot;Hello &quot; + name
}

hello(name: &quot;Jack&quot;)    


func hello1(name:String?)-&gt; String{
    return &quot;Hello &quot; + (name != nil  ? name! : &quot;guess&quot;)
}

hello1(name: &quot;Jack&quot;)


func printHello(){
    print(&quot;hello&quot;)
}
printHello()

func printHello1() -&gt; Void{  //Void 是一个类型
    print(&quot;hello&quot;)
}
printHello1()

func printHello2() -&gt; (){
    print(&quot;hello&quot;)
}
printHello2()    
</code></pre>

<p><strong>使用元组作为返回值</strong>  函数返回值的类型可以是字符串,整型,浮点型等,元组与数组类似,不同的是,元组中的元素可以是任意类型,使用的是括号,你可以使用元组类型让多个值作为一个复合值从函数中返回。</p>

<pre><code>func findMaxAndMin(numbers:[Int]) -&gt; (max:Int, min:Int)?{ //如果你不确定返回的元组一定不为nil，那么你可以返回一个可选的元组类型。
    guard !numbers.isEmpty else {
        return (Int.max,Int.min)
    }
    var minValue = numbers[0]
    var maxValue = numbers[0]
    for num in numbers{
        minValue = minValue &lt; num ? minValue : num
        maxValue =  maxValue &gt; num ? maxValue : num
    }
    return (maxValue ,minValue)
}
var numbers = [1,23,34,2,2,31,23,23,34,45,454545,4,54,5,45,45,45]
var result =  findMaxAndMin(numbers: numbers)
print(result?.max ?? 0,result?.min ?? 0)  
if let result =  findMaxAndMin(numbers: numbers) {
    print( result.max,result.min)
}
</code></pre>

<p><strong>函数的内部参数和外部参数</strong></p>

<pre><code>func sayHelloTo(name:String, msg:String)-&gt; String{
    return &quot;\(msg), \(name)&quot;
}
sayHelloTo(name: &quot;a&quot;, msg: &quot;b&quot;)  //sayHelloTo(&quot;a&quot;, msg: &quot;b&quot;) 这种方式已被废弃

//内部参数和外部参数
func sayHelloTo(name:String, withMessage msg:String)-&gt; String{
    return &quot;\(msg), \(name)&quot;
}
sayHelloTo(name: &quot;a&quot;, withMessage: &quot;b&quot;)

//修改外部参数名
func sayHello(to name:String, withMessage msg:String)-&gt; String{
    return &quot;\(msg), \(name)&quot;
}
sayHello(to : &quot;a&quot;, withMessage: &quot;b&quot;)

//隐藏调用参数
func mutiply(_ num1:Int, _ num2:Int) -&gt; Int{
    return num1*num2
}
mutiply(2,  4) 
</code></pre>

<p><strong>默认参数值</strong></p>

<pre><code>func sayHello(to name:String, withMessage msg:String = &quot;hello&quot;)-&gt; String{
    return &quot;\(msg), \(name)&quot;
}
sayHello(to : &quot;a&quot;, withMessage: &quot;b&quot;)
sayHello(to: &quot;jack&quot;) //可以省略后面的一个参数


func sayHello(to name:String, withMessage msg:String = &quot;hello&quot;, punctuation:String = &quot;!&quot;)-&gt; String{
    return &quot;\(msg), \(name) \(punctuation)&quot;
}
sayHello(to : &quot;a&quot;, withMessage: &quot;b&quot;)
sayHello(to: &quot;jack&quot;)
sayHello(to: &quot;Jack&quot;, withMessage: &quot;Hello&quot;)
</code></pre>

<p><strong>可变参数值</strong> 一个函数至多只可以有一个变长的参数</p>

<pre><code>//常用的变长参数函数
print(&quot;a&quot;,&quot;b&quot;,&quot;c&quot;)
//求平均值
func mean(numbers:Double ...) -&gt;Double{
    var sum : Double = 0
    for num in numbers{
        sum += num
    }
    return sum / Double(numbers.count)
}
mean(numbers: 1,2,3,4,5,5.0,23,434)
</code></pre>

<p><strong>常量参数,变量参数和 inout 参数</strong> 默认的函数参数都是常量。</p>

<pre><code>func toBinary(num:Int)-&gt;String{ //直接声明称 var 类型参数已被废弃。
    var num = num  
    var res = &quot;&quot;
    repeat{
        res = String(num%2) + res
        num /= 2
    }while num != 0
    return res
}
toBinary(num: 1000)

//inout 
func toBinary( num:inout Int)-&gt;String{
    var res = &quot;&quot;
    repeat{
        res = String(num%2) + res
        num /= 2
    }while num != 0
    return res
}
var num = 100
toBinary(num: &amp;num) //传入指针
print(num) 

//交换两个字符串
func swapTwoString(str1:inout String, str2:inout String){
    let tstr = str1
    str1 = str2
    str2 = tstr
}

var str1 = &quot;a&quot;
var str2 = &quot;b&quot;
swapTwoString(str1: &amp;str1, str2:&amp;str2)
str1
str2
</code></pre>

<p><strong>函数型变量</strong></p>

<pre><code>func add(a:Int, b:Int) -&gt; Int{
    return a + b
}

let add01 = add
add01(3,4)
let add02:(Int, Int) -&gt; Int = add
add02(4,5)


var arr:[Int] = []
for _ in 0...100{
    arr.append(Int(arc4random()%1000))
}

arr.sort { (a, b) -&gt; Bool in
    return a &lt; b
}
arr

func descending (a:Int ,b:Int) -&gt;Bool{
    return a &gt; b
}
arr.sorted(by: descending)
</code></pre>

<p><strong>函数变成初步</strong></p>

<pre><code>func changeScores( scors: [Int], by method:(Int)-&gt; Int) -&gt; [Int]{
    var arr = scors
    for (index , score) in scors.enumerated(){
        arr[index] = method(score)
    }
    return arr
}
func changeScore01 (score : Int) -&gt; Int{
    return score + 3
}

func changeScore02 (score : Int) -&gt; Int{
    return Int(Double(score)/150.0*100.0)
}

var arr:[Int] = []
for _ in 0..&lt;10{
    arr.append(Int(arc4random())%150)
}
arr
changeScores(scors: arr, by: changeScore01)
changeScores(scors: arr, by: changeScore02)
//map 
arr.map(changeScore01)
func isPassOrFail(score:Int)-&gt;String{
    return score &lt; 60 ? &quot;Fail&quot;: &quot;Pass&quot;
}
arr.map(isPassOrFail)

//filter 过滤
func fail (score:Int)-&gt; Bool{
    return score &lt; 60
}
arr.filter(fail)

//reduce 聚合
func add(a:Int, b:Int)-&gt; Int{
    return a + b
}
arr.reduce(0, add)

arr.reduce(0, +)

//Swift中,运算符号 本质上就是一个函数 
public func +(lhs: Int, rhs: Int) -&gt; Int
public func *(lhs: Int, rhs: Int) -&gt; Int
public func -(lhs: Int, rhs: Int) -&gt; Int
public func /(lhs: Int, rhs: Int) -&gt; Int
public func %(lhs: Int, rhs: Int) -&gt; Int


func concatenate(str:String , num:Int) -&gt; String{
    return &quot;\(str)\(num) &quot;
}
arr.reduce(&quot;&quot;, concatenate)
</code></pre>

<p><strong>返回函数类型和函数嵌套</strong></p>

<pre><code>//邮递费用
func tilerMailfeeByWight( weight : Int) -&gt; Int{
    return 1*weight
}
func tiler2MailfeeByWight( weight : Int) -&gt; Int{
    return 3*weight
}
//超过10单位，则按三倍计算
func feeBytUnitPrice (price :Int , wight:Int) -&gt; Int{
    py
    func chooseMailFeeCalationByWeight(weight: Int) -&gt; (Int) -&gt; Int{
        return weight &lt;= 10 ? tilerMailfeeByWight : tiler2MailfeeByWight
    }

    let mailFeefuc = chooseMailFeeCalationByWeight(weight: wight)
    return mailFeefuc(wight) + price*wight //邮递费用+商品费用
}
feeBytUnitPrice(price: 2, wight: 11)
</code></pre>

                      
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                            <p style="margin-top:0px;">作者：<a target="_blank" href="http://blog.flywithme.top/">Brasbug</a>
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                            文章版权归本人所有，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，否则保留追究法律责任的权利。 </p>
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